Obviously, the risk of infection will be higher when there is a large opening in the amniotic sac directly over the cervix, and the risk of infection will be almost negligible when the fluid is leaking from a high leak in the hindwaters. Bacteria would have to be awfully clever to find their way against a tide of outflowing fluid to find a small opening high in the amniotic sac.
Some ways to tell that the fluid is coming from a high leak in the hindwaters:
Belly still feels full of fluid, and baby's body isn't clearly outlined in the belly
Without touching the cervix, do a vaginal exam with sterile gloves to palpate the lower uterine segment directly inside the vagina. If the baby is easily ballotable, meaning it kind of floats up a bit, then there's still fluid in the belly, and the leak isn't over the cervix.
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